Hello, everybody!

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Source code for Tor 0.3.5.11, 0.4.2.8, and 0.4.3.6 is now available; you can download the source code from the usual place on the website -- the download page at for the latest series, and https://dist.torproject.org for older series. Packages should be available within the next several weeks, with a new Tor Browser around the end of the month.

These releases fix numerous issues, including a denial-of-service attack affecting all clients and relays using the NSS library. (If your Tor is built with OpenSSL, which is the default, you don't need to worry about this one. But if you're using NSS, you should upgrade.)

Below is the changelog for 0.4.3.6. You can find the changelogs for the other stable releases here:

https://gitweb.torproject.org/tor.git/tree/ChangeLog?h=tor-0.4.2.8 https://gitweb.torproject.org/tor.git/tree/ChangeLog?h=tor-0.4.3.6

There is also a new alpha release today; that announcement will go to the tor-talk mailing list, as usual.

Changes in version 0.4.3.6 - 2020-07-09 Tor 0.4.3.6 backports several bugfixes from later releases, including some affecting usability.

This release also fixes TROVE-2020-001, a medium-severity denial of service vulnerability affecting all versions of Tor when compiled with the NSS encryption library. (This is not the default configuration.) Using this vulnerability, an attacker could cause an affected Tor instance to crash remotely. This issue is also tracked as CVE-2020- 15572. Anybody running a version of Tor built with the NSS library should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha or later.

o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha): - Fix a crash due to an out-of-bound memory access when Tor is compiled with NSS support. Fixes bug 33119; bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001 and CVE-2020-15572.

o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha): - Use the correct 64-bit printf format when compiling with MINGW on Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.

o Minor bugfixes (client performance, backport from 0.4.4.1-alpha): - Resume use of preemptively-built circuits when UseEntryGuards is set to 0. We accidentally disabled this feature with that config setting, leading to slower load times. Fixes bug 34303; bugfix on 0.3.3.2-alpha.

o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha): - Fix a compiler warning on platforms with 32-bit time_t values. Fixes bug 40028; bugfix on 0.3.2.8-rc.

o Minor bugfixes (linux seccomp sandbox, nss, backport from 0.4.4.1-alpha): - Fix a startup crash when tor is compiled with --enable-nss and sandbox support is enabled. Fixes bug 34130; bugfix on 0.3.5.1-alpha. Patch by Daniel Pinto.

o Minor bugfixes (logging, backport from 0.4.4.2-alpha): - Downgrade a noisy log message that could occur naturally when receiving an extrainfo document that we no longer want. Fixes bug 16016; bugfix on 0.2.6.3-alpha.

o Minor bugfixes (manual page, backport from 0.4.4.1-alpha): - Update the man page to reflect that MinUptimeHidServDirectoryV2 defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha.

o Minor bugfixes (onion service v3, backport from 0.4.4.1-alpha): - Prevent an assert() that would occur when cleaning the client descriptor cache, and attempting to close circuits for a non- decrypted descriptor (lacking client authorization). Fixes bug 33458; bugfix on 0.4.2.1-alpha.

o Minor bugfixes (portability, backport from 0.4.4.1-alpha): - Fix a portability error in the configure script, where we were using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5.

o Minor bugfixes (relays, backport from 0.4.4.1-alpha): - Stop advertising incorrect IPv6 ORPorts in relay and bridge descriptors, when the IPv6 port was configured as "auto". Fixes bug 32588; bugfix on 0.2.3.9-alpha.

o Documentation (backport from 0.4.4.1-alpha): - Fix several doxygen warnings related to imbalanced groups. Closes ticket 34255.